Rock-drill.



W. A. SMITH.

ROCK DRILL.

`APPLICATION man SEPT. 26. |914.

Patented Nov. 14, 1916.

4 SHEETS-SHEET lv.

W. A. SMITH. .ROYCK DRILL.

APPU .26| |914. 1,204,708. Patented Nov. 14, 1916.

4 SSSSSSSSSSS T g.

W. A. SMITH.

l 1914. 1,204,708. Patented Nov. 14, 1916.

4 SHEETS-SHEET 3.

W. A. SMITH.

ROCK DRILL.

APPLICAIION FILED SEPT. 26. |914.

Patented Nov. 14, 1916.

4 SHEETS-SHEET 4.

UNTTTD STATES PATENT QTTTCT WILLIAM A. SMITH, or DENVER, COLORADO, AssIGNoR To rrIE DENVER ROCK DRILL MANUFACTURING COMPANI, OE DENVER, COLORADO, 'A' CORPORATION OE DELA- WARE.

memos.

RoCKfDRILL.

Specification of Letters Patent.

Patented Nov..14,1916.

Appueation mea september 2s., 1914. serial No. 863,664.

The present invention relates to rock drill` ing apparatus, and One of the primary Objects is to provide a novel and effective meansfor delivering a cleansing agent to the bore of a hollow drill bit, Yfor the pur-V pose of removing the cuttings from the drill hole.

A further and important ob]- ect is to pro-A vide novel and eiitective means for rotating the drill bit, .this means being positive in action, and yet permitting the parts, with the exception of the drill chuck, to continue in 0 operation should the drill bit become stuck,

thereby avoiding the danger lof injury and breakage to the mechanism.

An embodiment of the invention that has proven very satisfactory, `is disclosed in the', Y M y i V liitman 17, the, compressor pistonV 15 will be 5 accompanying drawings, wherein :f-

Figure 1 is a side elevation of the apparatus. Fig.2 is a plan View partially in horizontal section. Fig. 8 is a front end view Vwith a portion of therchuck casing -0 broken away. Fig. et is a detail longitudi? nal sectional .v-iewon a somewhat enlarged scale. Fig. 5 is a detail viewpartially inVV Section jof the cooperating shafts of the chuck rotating means. Fig. 6 is a detail 5 perspective View of the friction gear. Fig.

7 isa ksimilar viewv of the rotating shaft.v Fig. 8y is a vdetail viewY on an enlarged scale of the pawl and ratchet 4mechanism lthat prevents the retrograde movementV of the ratchet member. Fig. 9 is a detail perspective .view partially broken awayofthedrill chuck. Fig. 10 is a perspective view of theV end of the rockl shafthaving the ratchet teeth, and Fig. `1l1`is afperspective view of the coacting ratchet member.. Fig. 12 a rear elevation o f the crank case, showing the operating handle for ,the by-pass controlling valve.

Similar reference numerals designate corresponding parts in all the figures ofthe drawings.

In the embodiment disclosed, a support.

isernployed in the form of a shell 10, and slidably mounted in Vguideways 11 of said V shell, is a carriage 12that v,may be lmo'ved through the medium of the usual screw, having a handle crank at the rear end, as shown at 13. Mounted on the carriage 12, is the drilling apparatus, and in the embodi- -nient disclosed, this includes a compressor and a motor.v The Compressor includes a provided with internal gear'teeth 21 andl an external ,ball-race 22. Engaged in said race 22 are anti-friction balls 23 that are also engaged in an outer raceway 241mou'ntl ed lin the flange 25 of the head 26of an eleetricmotor 27. T-he armature 28 of this meter is mounted o n af shaft 29, carrying a pinion 30 that is in mesh with the'int'ernal gear 21. It will thus be seen that -if the motor is inoperatiom the gear 21 willbe ro- Htate'd, thereby effecting the operation ofthe v crank V18,` and through the medium of the reciprocated. y y

The drill motor vcomprises a vcylinder member 31, within which is located a -ree hammer piston y3'2that driven back andV `forth by the air alternatelyv compressed on C 1 9 has Ysecured topits'inner face, a ring 20 der 31I onV opposite sides of the piston 32 by y passages 83 and 3e, the passage 3a having a Y nut .40, threaded upon its rear` projecting end. -This V'valve constitutes, inv eiect, a check valve, ,and it has l,a yhub portion L11 the spindleV 39 hasan outstandingvflange 13,

` and spring 44, interposed-between the flanges 42'and;43,serve s. tofur'ge the yalve-V toelosed position. Inthe outer'wallofthe ,Cylinder member 14 is Vorrned V a i byV-pass front port V35 vand a'rear 4port 3 6/ that lis in in the inner Y' slidably. mounted Ona reducedportio'n; of the .Spindle 39, .the hub having en ntulned Vlange t2atits inner end. The front end .of

Yf :oinplishe a longitudinal passageway 45 having end perfs 4.6, sperling site 'the Eads,

of the piston chamber. This by-pass is controlled by a rotary valve a mounted longitudinally inthe passageway 45, and having a longitudinal bore 46a therein, this bore communicating with transverse ports- 45b that are movable into and out of register with the ports 46. The valve is operated by a shaft 46b having an angular end 45c t-hat engages in a corresponding socket in the rear end of the valve and'being held therein by a coiled spring 46. The rear end of the shaft 46b projects through the rear end of the crank case, which crank case is designated 45, andthe projecting end has an operating handle 46d that is movable between two stops 45e.

The front end of the cylinder' member 31 is provided with a head bushing 47, over whichis mounted a cap 48 that contains a rotatable chill-holding chuck 49. Said chuck has a socket 50 arranged to detachably receive the rear end of a tool 51, said tool having an angular enlargement 52 engaged in the chuck so as to ca use the two to rotate together. The tool isprovided with a passageway 53 therethrough, for the purpose of delivering cleaning fluid'to the rbottom of the drill hole. A tappet 54 is slidably mounted in the head bushing 47, its inner end projecting into the cylinder member 31 in a position to be struck by the piston 32, its outer end being abutted against by the rear end of the drill bit 51. 1n order that the abutting facesV of the tappet and drill bit may also be in propel' Contact to obviate leakage of the cleansing fluid, a spring 55 is interposed between the flanged front endv 56 of said tappet and a shoulder 57 formed upon thev head Vbushing 47, saidY spring thus urging the tappet forwardly.

For the purpose of delivering cleansing `fluid 'to the bore 53 of the drill bit 51, a tube 58 extends longitudinally and centrally through the cylinder 81, through the piston :32, and intothe tappet 54, terminating short of the frontend of said tappet, this tube also extending ythrough a central bore formed in the valvesupporting spindle 39,V

and its rear end is mounted in the rear head r Y 59 of the cylinder member 31, being held in lplace by .yielding packing 60 surrounding the same, saidrpacking being compressed about the rear end of the tube by a plug 61, as will be readily/understood. The cleansing fluid is supplied from any suitable source to a coupling socket 62 formed in the head 59, and is delivered through a passageway 63 Yformed partly in the head 59 and partly in the plug 61.

As above stated, the chuck 49 is rotatable,

f and the following mechanism is preferably employed for securing its rotation Vwhen the drill is in operation. K Journaled alongside the cylinder member 31 and below the cylinder member 14, is a rotatable shaft 64 having a tapered front portion 65 and an angular rear end 66. Mounted on the tapered portion 65, is a bronze bushing 67, surrounding which is the elongated hub 68 of a gear pinion 69, that thus has a frictional bearing or mounting on said shaft. it is held in place by nuts 70 threaded on the front end of the shaft 64, with spring washers 71 interposed between said nuts and the end of the gear pinion. rEhe pinion 69, in the embodiment disclosed, is in mesh with an idler pinion 72, which in turn meshes with gear teeth 7 3 formed upon the rear end of the chuck sleeve, as shown clearly in Fig. 9.

Journaled in alinement with the shaft 64, and arranged in rear thereof, is a rock shaft 74, having its front end formed into ratchet teeth 75. A ratchet member 76, slidably mounted on the angular end 66 of the shaft 64, and held thereby against relative rotation with respect to said shaft 64, has teeth 7 7 that are movable into and out of coaction with the teeth7 5. A coiled spring 7 8, bearing against the member 76, urges it rearwardly, so that the teeth 77 will coact with the teeth 75. The member 76, furthermore,

Vhas a peripheral series of ratchet teeth 79,

with which a spring-pressed pawl 8O co operates to prevent the retrograde rotation of t-he member 76 and shaft 64. c The rear end of the rock shaft 74 has a beveled gear section 81, with which meshes a corresponding beveled gear section 82 carried by the inner end of a crank shaft 88 that Yis journaled in the frame, the outer end of nected, as illustrated at 88 to said pitman 17.

The operation of the structure is substantially as follows z-VVhenY the motor 27 is in operation, the compressor piston, as already described, is reciprocated, causing the air under compression to be alternately delivered into the cylinder 31 on opposite sides of the piston 39, and causing the reciprocation of said piston. At each forward movementof the piston, a blow is struck against the tappet 54, and said blow is transmitted to the drill bit. Inasmuch as the pitman 17 is given a rapid gyratory movement, the pitinan carried thereupon is given a corresponding movement. Consequently the crank shaft 83 and rock shaft 74 are turned back and forth. The teeth of the rock shaft, upon their rearward movement, pass over the teeth .77 of the ratchet member 76, said member sliding forward, on the shaft 64 until the teeth 7 5 have passed, whereupon the member 76 is kreturned by the spring 76, and the two sets of teeth are interlocked. Upon the return movement, therefore, the

motion is transmitted through the gearing Y 69, 72 and 73 to the chuck, and consequently to the drill bit located therein.V If such drill bit should become stuck, the frictional Y mounting of the pinion 69 upon the shaft 64 Will permit said shaft to slip, and thus obviate the danger of injury to the remaining parts of the mechanism. YIt is often the case, moreover, that the cuttings will become packed around the drill bit, making it eX- ceedingly difficult to Withdraw the same from the hole.. lilith the present structure, this can be readily accomplished, for by turning the valve 46a, so that the by-pass 46 is open, the motor piston 32 Will be substantially stopped While the rotation of the drill bit continues, and consequently by turning the feed seresY rearwardly, by means of the handle 13, the drill bit will bore its way out through the packed cuttings as the machine is Withdrawn. Y

The cleansing agent, as already explained, is delivered "to the drill bit through the tube 58, and because of the relatively Vtight joint maintained between the tappet and the rear end of such drill bit by the spring 55, there is little leakage at this point.

From the foregoing, it is thought that the construction, operation and many advantages of the herein Ydescribed invention Will be apparent to those skilled in the art, With-` out further description, and it will be understood that various changes in the size, shape, proportion, and minor details of construction may be resorted to Without departing from the spirit or sacrificing any of the advantages of the invention.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is: Y

l. In drilling apparatus, the combination with a motor, comprising a cylinder member and a piston operating therein, of a compressor' comprising a cylinder member andV piston ope 'ating therein, means for driving the compressor piston,including a piti man, a tool-holding chuck, and means actuated by said pitman for rotating the chuck.

2. In drilling apparatus, the combination with a motor, comprising a cylinder member and a piston operating therein, of a compressor' comprising a cylinder member and a piston operating therein, meansfor driving the compressor piston, including a pitman, a tool-holding chuck, and means operated by said pitmanfor effecting a step-bystep rotation of the chuck. Y Y

3. In drilling` apparatus, the combination with a motor, comprising a cylinder member and a piston operating therein, of a compressor comprising a cylinder' member and a piston operating therein, means for driving the compressor piston, including a pitman, a rotatable tool-holding chuck, a shaft geared thereto, ratchet mechanism for rotating the shaft, and means actuated by the pitman for operating the ratchet mechanism.

4. In drilling apparatus, the combination with a motor, comprising a cylinder member and a piston operating therein, of acompressor comprising a cylinder member and a piston operating therein, means for driving the compressor piston, including a pitman, a rotatable tool-holding chuck, a shaft geared thereto, a ratchet element on the shaft, a rock shaft having a coacting ratchet element,

' and means operated by the pitman for rocking said shaft. p c 5. Indrilling apparatus, the combination with a motor, comprising a cylinder mem- Y ber'and a piston operating therein, of a compressor comprising a cylinder member and a piston operating therein, mean-s' for driving the Vcompresser piston, `including aV pitman, a

rotatable tool-holding chuck having gear l teeththereon, ay shaft geared to said. gear teeth, a rock shaft in line With the first- Y mentioned shaft, a ratchet connection between the two shafts Yfor imparting a step-by-step rotation to the former upon the rocking movement of the latter, a crank shaft geared to the rock shaft, and a pitman vconnection between the compressor pitman and the crank shaft.

6. In drilling apparatus, the combination Y With a cylinder member, of a piston operating therein, a rotatable tool-holding chuck, a shaft, aslip ,crear connection betvveen the shaft and chuck that permits their'l relative rotation under abnormal resistance, and ratchet mechanism Vfor rotating the shaft.

7. In drilling apparatus, the combination -with a cylinder member and a piston operating therein, of a rotatable tool-holding chuck, a shaft having a tapered end and an angular'. end, a gear-frictionally mounted on the tapered end and geared to the chuck andpermitting the relative rotation the shaft and gear under Vabnormal resistance, a ratchet element mounted on the angular end, another ratchet element coacting With said first-mentioned elementgand means for giving the second element an oscillatory movement. v

8. In drilling apparatus, the' combination With a cylinder member and Va piston operheld thereon against relative rotation, av rock shaft having a ratchet member coacting with the first mentioned ratchet member, Vand' means for imparting a back-and-forth movement to the rock shaft.V Y

iso

9. In drilling` apparatus, the combination with n motor7 comprising zt cylinder member, zt piston und e rotatable chuck, or' a ccmpreesor, including` e piston, a driving motor for the compressor, e connection between the driving motor und the compressor' piston having e backend-:forth movement, e rotetehle device geared to the chuck, and ratchet mechanism operated by seid connection and operatingon the rotatable derice5 to eect a Step-o V-step rotatie-n thereof.

l0. In drilling apparatus, the combination with n motor, comin-iene; n cylinder mem# bei; e piston opere lng therein, sind rotatable tool-holding1 chuckS a shaft located longitudinally of the cylinder member and heving n slip gear conne-#ction with the chuck7 e rock shaft zilined with the iirstmientioned ehn'ft and having :t ratchet connection therewith, and menne tor turning' the roch shaft hack and forth.

l. ln drilling apparatus, the combination with n motor, of :i hammer cylinder, compressor piston an internal gear being Copies of this patent may be obtained for mounted on Seid motor heed by en annular ball recept cran r disk being` mounted 0n said internal geen and e channeled pitman having e rc cker shaft pitman inserted in its channel, u connection between the channeled pitmen. and the piston, and tool rotating means operated by the rocker shaft pitman.

l2; En. a drilling apparatus', the combinetion with a cylinder member, or' e piston operating therein, a rotatable 'tool holding chuck, a shaft7 e slip gear connection between the shaft and chuck torpermit their relative rotation under abnormal resistance, seid slip gear being mounted with :t friction metal bushing between said slip gear and shaft.

ln testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

WLlilAll/I A. SMITH.

7i tneeses VILLIAM H. LEONARD, JESSIE TURNER.

five cents each, by addressing the Commissioner of Patents,

WeshingtenQD. C. 

